Need some advice about my Mom

Samantha
Hi ladies, my relationship with my Mom has always been up and down. For 15+ years now she's has a bad drinking problem. At chirstmas this year she freaked out and verbally attacked my entire family. We stayed in the same hotel as her so when we got home things got worse. Her and my step-dad got into a physical fight which resulted in my husband and my toddler leaving at midnight and driving to my grandparents house to stay. This is nothing new to me. She has pulled stunts like this 100's of times. She says she's sorry but not really. I guess my question is am I validated in cutting her from my life. I know she's not going to change and she doesn't see the seriousness of what she did. My number 1 priority is my kids. I don't want my kids to see physical violence especially between a man/woman, husband/wife.